org.objectweb.asm.Opcodes# V1_3 ( ) 源码实例Demo

/** Gets the class file version corresponding to the given source version constant. */
public static int sourceVersionToClassFileVersion(SourceVersion version) {
  switch (version) {
    case RELEASE_0:
      return Opcodes.V1_1; // JVMS8 4.1: 1.0 and 1.1 both support version 45.3 (Opcodes.V1_1)
    case RELEASE_1:
      return Opcodes.V1_1;
    case RELEASE_2:
      return Opcodes.V1_2;
    case RELEASE_3:
      return Opcodes.V1_3;
    case RELEASE_4:
      return Opcodes.V1_4;
    case RELEASE_5:
      return Opcodes.V1_5;
    case RELEASE_6:
      return Opcodes.V1_6;
    case RELEASE_7:
      return Opcodes.V1_7;
    case RELEASE_8:
      return Opcodes.V1_8;
    default:
      throw new IllegalArgumentException(String.format("Unexpected source version: %s", version));
  }
}
 

/** Gets the class file version corresponding to the given source version constant. */
public static int sourceVersionToClassFileVersion(SourceVersion version) {
  switch (version) {
    case RELEASE_0:
      return Opcodes.V1_1; // JVMS8 4.1: 1.0 and 1.1 both support version 45.3 (Opcodes.V1_1)
    case RELEASE_1:
      return Opcodes.V1_1;
    case RELEASE_2:
      return Opcodes.V1_2;
    case RELEASE_3:
      return Opcodes.V1_3;
    case RELEASE_4:
      return Opcodes.V1_4;
    case RELEASE_5:
      return Opcodes.V1_5;
    case RELEASE_6:
      return Opcodes.V1_6;
    case RELEASE_7:
      return Opcodes.V1_7;
    case RELEASE_8:
      return Opcodes.V1_8;
    case RELEASE_9:
      return Opcodes.V9;
    case RELEASE_10:
      return Opcodes.V10;
    case RELEASE_11:
      return Opcodes.V11;
    default:
      throw new IllegalArgumentException(String.format("Unexpected source version: %s", version));
  }
}
 

@Override
public void visit(final int version, final int access, final String name, final String signature, final String superName,
    final String[] interfaces) {
  String simpleName;
  if (name == null) {
    simpleName = "module-info";
  } else {
    int n = name.lastIndexOf('/');
    if (n == -1) {
      simpleName = name;
    } else {
      text.add("package asm." + name.substring(0, n).replace('/', '.') + ";\n");
      simpleName = name.substring(n + 1).replace('-', '_');
    }
  }
  text.add("import java.util.*;\n");
  text.add("import org.objectweb.asm.*;\n");
  text.add("public class " + simpleName + "Dump implements Opcodes {\n\n");
  text.add("public static byte[] dump () throws Exception {\n\n");
  text.add("ClassWriter cw = new ClassWriter(0);\n");
  text.add("FieldVisitor fv;\n");
  text.add("MethodVisitor mv;\n");
  text.add("AnnotationVisitor av0;\n\n");

  buf.setLength(0);
  buf.append("cw.visit(");
  switch (version) {
  case Opcodes.V1_1:
    buf.append("V1_1");
    break;
  case Opcodes.V1_2:
    buf.append("V1_2");
    break;
  case Opcodes.V1_3:
    buf.append("V1_3");
    break;
  case Opcodes.V1_4:
    buf.append("V1_4");
    break;
  case Opcodes.V1_5:
    buf.append("V1_5");
    break;
  case Opcodes.V1_6:
    buf.append("V1_6");
    break;
  case Opcodes.V1_7:
    buf.append("V1_7");
    break;
  case Opcodes.V1_8:
    buf.append("V1_8");
    break;
  case Opcodes.V9:
    buf.append("V9");
    break;
  default:
    buf.append(version);
    break;
  }
  buf.append(", ");
  appendAccess(access | ACCESS_CLASS);
  buf.append(", ");
  appendConstant(name);
  buf.append(", ");
  appendConstant(signature);
  buf.append(", ");
  appendConstant(superName);
  buf.append(", ");
  if (interfaces != null && interfaces.length > 0) {
    buf.append("new String[] {");
    for (int i = 0; i < interfaces.length; ++i) {
      buf.append(i == 0 ? " " : ", ");
      appendConstant(interfaces[i]);
    }
    buf.append(" }");
  } else {
    buf.append("null");
  }
  buf.append(");\n\n");
  text.add(buf.toString());
}
 

/**
 * Creates a new ASM backend
 * @param sc The SootClass that is to be converted into bytecode
 * @param javaVersion A particular Java version enforced by the user, may be 0 for automatic detection, must not be lower than necessary for all features used
 */
public AbstractASMBackend(SootClass sc, int javaVersion) {
	this.sc = sc;
	
	int minVersion = getMinJavaVersion(sc);		

	if (javaVersion == 0)
		javaVersion = Options.java_version_default;
	
	if(javaVersion != Options.java_version_default && javaVersion < minVersion){
		throw new IllegalArgumentException("Enforced Java version " + translateJavaVersion(javaVersion) + " too low to support required features (" + translateJavaVersion(minVersion) + " required)");
	}
	
	javaVersion = Math.max(javaVersion, minVersion);

	switch (javaVersion) {
	case Options.java_version_1_1:
		this.javaVersion = Opcodes.V1_1;
		break;
	case Options.java_version_1_2:
		this.javaVersion = Opcodes.V1_2;
		break;
	case Options.java_version_1_3:
		this.javaVersion = Opcodes.V1_3;
		break;
	case Options.java_version_1_4:
		this.javaVersion = Opcodes.V1_4;
		break;
	case Options.java_version_1_5:
		this.javaVersion = Opcodes.V1_5;
		break;
	case Options.java_version_1_6:
		this.javaVersion = Opcodes.V1_6;
		break;
	case Options.java_version_1_7:
		this.javaVersion = Opcodes.V1_7;
		break;
	case Options.java_version_1_8:
		this.javaVersion = Opcodes.V1_8;
		break;
	}
}